[libvirt] [PATCH] virsh: Document change-media --live --config confusion

[Cole Robinson]

If 'virsh change-media --live --config ...' is requested, the
inactive XML is used as the template for the media change/eject.
If the runtime XML has diverged from the inactive XML, say via
other update operations, those changes may be undone since the
command will sync all non-path XML with the inactive config.

To 'fix' this would involve two passes of XML editing and calls
to UpdateDevice, which is kind of a pain for a case that won't
affect most users. So let's just document it instead

https://bugzilla.redhat.com/show_bug.cgi?id=1243342
---
 tools/virsh.pod | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/virsh.pod b/tools/virsh.pod
index 90ab47d..4c1b7fc 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -2794,6 +2794,9 @@ the hypervisor's implementation.
 Both I<--live> and I<--config> flags may be given, but I<--current> is
 exclusive. If no flag is specified, behavior is different depending
 on hypervisor.
+If both I<--live> and I<--config> are specified, the inactive device XML
+is used as the template for the media change. If your I<--live> device XML
+has received runtime changes, they may be removed.
 If I<--print-xml> is specified, the XML that would be used to change media is
 printed instead of changing the media.
 
-- 
2.7.4